// Skips fields until finds MsgType. Throws if MsgType can't be found.
static MsgType FindMsgType(IEnumerator <Field> fields)
{
MsgType msgType = new MsgType();
while (fields.MoveNext())
{
int tag = Deserialization.ParseInt(fields.Current.Tag);
if (msgType.AcceptField(tag, fields.Current.Value) == FieldAcceptance.Accepted)
{
return(msgType);
}
}
throw new MsgTypeNotFoundException();
}
// Throws if the message is malformed.
// Returns null if message type isn't recognized.
// If the result is not null, it's guaranteed to inherit from Fix44.Message
// and implement IClientMessage, IServerMessage, or both.
public Mantle.IMessage CreateMessage(IEnumerator <Field> fields)
{
MsgType msgType = FindMsgType(fields);
IMessage msg = NewMessage(msgType);
if (msg != null)
{
while (fields.MoveNext())
{
int tag = Deserialization.ParseInt(fields.Current.Tag);
msg.AcceptField(tag, fields.Current.Value);
}
}
return(msg);
}
// Throws if the protocol can't be recognized.
IMessageFactory GetFactory(IEnumerator <Field> fields)
{
if (!fields.MoveNext())
{
throw new MissingBeginStringException();
}
int tag = Deserialization.ParseInt(fields.Current.Tag);
BeginString version = new BeginString();
if (version.AcceptField(tag, fields.Current.Value) != FieldAcceptance.Accepted)
{
throw new MissingBeginStringException();
}
if (!_protocols.ContainsKey(version.Value))
{
throw new UnsupportedProtocolException(String.Format("Unrecognized protocol: {0}", version.Value));
}
return(_protocols[version.Value]);
}
protected override int Deserialize(ArraySegment <byte> bytes)
{
return(Deserialization.ParseInt(bytes));
}